Free-swinging mechanism for imparting reciprocatory movements



Feb. 11, 1930. J DENHAM 1,746,338

FREE SWINGING MECHANISM .FOR 'IMPARTING RECIPROCATORY MOVEMENTS FiledJuly 27, 1928 2 Sheets-Sheet 1 Fig.1

$ jpenh m Feb. 11, 1930. H. J. DENHAM 1,746,333

FREE SWINGING MECHANISM FOR IMPARTING RECIPROUATORY MOVEMENTS FiledJuly, 27, 1928 2 Sheets-Sheet 2 Fig.2

nvvewrae Patented Feb. 11, 1930 UNITED STATES PATENT OFFICE HUMPI-IREYJOHN DENI-IAM, OF MANCHESTER, ENGLAND, ASSIGNOR T HENRY SIMON LIMITED,OF MANCHESTER, ENGLAND, A BRITISH COMPANY FREE-SWINGING MECHANISM FORIMPARTING RECIPROCATORY MOVEMENTS Application filed July 27, 1928,Serial No. 295,812, and. in Great Britain May 11, 1928.

This invention relates to What are known as free swinging mechanisms forimparting reclprocatory movements to screens, conveyors, sieves and thelike, the mechanism being carried by the part to be reciprocated.

The object of this invention is to provide improved and simplified meansof the type aforesaid and it comprises a framehaving a crank shaftjournalled therein and a slotted and weighted lever pivoted thereon, thecrank pin of said shaft acting upon said lever so that unequal rates ofacceleration are imparted thereto on the rotation of the shaft, theinertia of the weighted lever relatively to that of the completestructure or mass to be reciprocated and by which the said free swingingmechanism is carried, resulting in the de sired reciprocation of saidmass atunequal rates on the forward and return strokes and with ajigging or jerking motion such as is desired in screens and the like.

Referring to the two accompanying sheets of explanatory drawings:-

Figure 1 is a sectional side elevation and Figure 2 a sectional endelevation illustrating a convenient application of the invention.

Like reference letters in the two views indicate like parts.

As shown in the drawings, the rotating crank shaft a and crank disc I)with the crank pin 0 projecting from one side of the same are enclosedwithin a frame or casing (Z by which the crankshaft a 1s carried; thesand frame (Z also pivotally supports the slotted and weighted lever c.The frame or casing-d is secured to and carried by the suspended screeni or like part f to be reciproc'ated. Theengag'ement between the crankpin 0 and lever e includes a block or slipper gadapted to slide betweenthe sides of the lever gap or slot, the said sides serving as guides.

The position of the lever gap or slot relatively to the rotating crankpin 0 is such that whilst each revolution of the said pin effects acomplete reciprocation or back and forth movement of the lever e, thedriving contact between the crank pin and the lever occurs, throughoutsuch revolution, at constantly varying distances from the fulcrum orsupporting pivot 72. of the Weighted lever. Due

to the inertia of the latter and its arrangement as aforesaid, unequalaccelerations and jigging or jerking movements are imparted to themember 7 being reciprocated and by which the mechanism is carried,corresponding to such varying distances. In this man nor there isobtained in connection with for example a sieve or screen a veryeffective sifting or riddling and propelling action.

In the example illustrated, the lever e is weighted by iron or othermetal plates as i attached to the opposite sides of the lever by studsas j.

The crank shaft or is driven through a belt as is or in any otherconvenient manner.

hat I claim is 1. In free swinging mechanisms of the type aforesaid, thecombination comprising a frame secured to or connected with the part orstructure to be reciprocated, a crank shaft journalled in said frame,and a weighted.

lever pivoted in the casing, said shaft having a crank pin engaged forvertical sliding movement with said weighted lever in such manner as toimpart unequal rates of acceleration thereto, as set forth.

2. In free swinging mechanism of the type aforesaid, in combination, aframe connected to the part to be reciprocated, a crank shaft journalledin said frame, a weighted lever pivotally carried in said frame, a crankpin upon said crank shaft movable in said lever away from and towardsthe lever pivot, and means for rotating said crank shaft whereb theweighted lever is oscillated.

3. In free swinging mechanism asclaimed in claim 1 of the type aforesaidwherein a cover is provided for-the casing, the lever being pi'votallysuspended from the under surface of the cover and provided at its lowerportion with a vertical slot, a guide bloc-k mounted on the crank pinslidably engaged with the slot and weight members mounted on oppositesides of the lower portion of the lever.

In testimony whereof I have signed my name to this specification.

HUMPHREY JOHN DENHAM.

